Fuel gun and aerator



Apri I9, 1938. W. l. SALLEE FUEL GUN AND AERATOR Filed July 20, 1954 5 Sheets-Sheet l vl.lllilllllfl April 19, 1938. w51. SALLEE 2,114,319 I FUEL GUN AND AERATOR Filed July 20, 1934 3 Sheets-Sheet 2 April 19, 1938. w SALLEE 2,114,319

FUEL GUN AND AERATOR Filed July 20, 1954 5 sheets-shge' s INVENTOR WEBSTER .SAL/.5E

l ATTORNEYS Patented Apr. 19, 1938 UNITED STATES PATENT OFFICE 11 Claims.

This invention relates to a fuel gun for burning Various types of fuel selectively or in different combinations, the principal object being to provide a gun which is simple in construction and economical to manufacture and which operates at high efliciency with pulverized fuels, liquid fuels, and gaseous or other carbonaceous fuels individually or in various combinations with each other.

Another object is to provide a gun which may readily be mounted for operation with and dismounted from a combustion chamber with which used and in which the various operating elements may be easily and quickly assembled and disassembled for servicing and repair.

A correlative object is to provide a fuel gun having an effective safety contro-1 by which the discharge of fuel is prevented while the gun is removed from operating position.

Advantages of the present apparatus reside in the efficient manner in which the fuels utilized are introduced into the gun and discharged therefrom as a combustible mixture to points of application and also in the manner in which the secondary air and fuel are well mixed and turbulence of the resultant mixture is effected.

Other objects and advantages will become apparent from the following specification wherein:

Fig. l is a side elevation of a fuel gun and mounting embodying the principles of the present invention, parts thereof being shown in section for clearness in illustration;

Fig. 2 is a rear end elevation of the apparatus illustrated in Fig. 1 showing the gun in operating position;

Fig. 3 is a fragmentary end elevation similar to Fig. 2 showing the gun and relative position of safety control elements thereof preparatory to removal of the gun from its support;

Figs. 4 and 5 are cross sectional views of the apparatus illustrated in Fig. l and are taken on planes indicated by the lines 4-4, 5-5 of Fig. 1 respectively;

Fig. 6 is a fragmentary cross sectional view taken on a plane indicated by the line 6-6 of Fig. 2;

Fig. 7 is a fragmentary view taken on a plane indicated by the line 'I-I of Fig. 6;

Figs. 8 and 9 are enlarged cross sectional views taken on planes indicated on lines 8 8, 9-9 respectively of Fig. 1; and

Fig. 10 is an enlarged longitudinal sectional view of the spinner cup of the gun.

Referring first to Figs. 1 and 2 in which a preferred embodiment of the invention is illustrated,

the gun comprises a tubular body portion I, a coaxial tubular neck portion 2 connected to the discharge end of the body portion I, a coaxial tubular extension 3 connected to the neck, and an inlet conduit 45, later to be described, connected to the opposite end of the body portion I, preferably by bolts as illustrated in Figs. 1 and 2, these parts forming a rigid unitary structure. Mounted within and forming part of the gun and coaxial therewith is a stationary pintle 4 which extends forwardly from its means of support through a neck portion 2 and protrudes part way into the extension 3. Rotatably mounted on the pintle 4 is a spinner cup 5, the cup 5 being flared radially outwardly both interiorly and exteriorly toward the discharge end of Athe extension 3 and being open toward the said discharge end. Carried on the cup 5 and substantially in the plane of the discharge opening of the extension 3 is a plurality of radially extending spinner blades 6 which, upon blowing air through the gun casing, toward the discharge end, cause the cup to rotate at high velocity. The pintle 4 is carried on suitable radial spider arms 8 and 9 secured to an annular collar I0 and preferably integral therewith. For ease in mounting and dismounting the pintle, the rear edge of the collar I and arms 8 and 9 abut the forward edge of the tubular body portion I. The collar I0 is secured in operating position by engagement of an external annular forwardly facing shoulder thereon with a complementary internal annular shoulder II in the neck portion 2 of the gun casing. The neck portion 2 extends rearwardly beyond the shoulder ll and is internally threaded to engage complementary threads on the forward end of the body portion I. Thus by unscrewing the neck portion 2 of the casing from the body portion I, the collar I Il and pintle and spinner assemblage may be removed from the gun as aunitary structure.

The wall of the body portion I is comparatively thick radially and is provided with longitudinally extending ducts I and I6 which terminate in the forward edges of the body member I for supplying lubricating oil and fuel oil respectively to the gun. In the form illustrated, the duct I5 i-s for the lubricating oil supply and the duct I6 for the fuel oil supply. The discharge ends of these ducts are so arranged relative to the spider arms 8 and 9 and the annular collar I0 that when the collar I0 is installed as above described, they will communicate respectively with complementary longitudinal extension ducts I8 and I9 provided in the spider arms 8 and 9 respectively. Radially extending ducts 20 and 2l communicating with the ducts i8 and I9 respectively are provided in the spider arms 8 and 9 and, in turn, connect these ducts respectively with longitudinally extending ducts 22 and 23 in the pintle, the duct 22 being positioned to discharge lubricant into the bearings of the pintle, later to be described, and the duct 23 discharging axially of the pintle out of the forward end thereof. A suitable cap 2li is carried on the pintle and positioned over the end of the duct 23, for retaining the spinner on the pintle, the cap 24 having a plurality of radially extending ducts 25 for discharging the fuel oil entering the cap radially into the interior of the spinner so that it may be discharged thereby with a swirling motion.

In order to admit gas to the gun, the body portion i is provided with a radially extending duct which discharges directly into the interior of the body portion l, as will later be described.

Referring next to the mounting of the spinner 5, the pintle d is provided with external bearing races spaced apart longitudinally of the pintle, each of which races carries a set of ball bearings 25, which engage internally and rotatably support a suitable sleeve extension 2l, coaxial with and connected to the spinner cup 5. At the relatively remote ends of the sets of bearings 23 .are suitable packing glands for preventing the entrance of foreign matter into the bearings. The duct 22 discharges lubricant between the sets of bearings. To assist in preventing entrance of foreign matter and also to distribute the oil along the portions of the pintle outwardly from the bearing sets, a plurality of spiral ribs 23 are provided. The ribs 2B, one set of which is better illustrated in Fig. l0, are spiraled in such direction that upon rotation of the cup by the blades 6, they effect a brushing and conveying action outwardly from the bearing sets and thus will continuously move any foreign matter away from the bearings.

In order to support the gun in operating position relative to a combustion chamber with which it is to be used and to supply secondary air in an efficient manner, a secondary air housing 30 is provided and is connected to a suitable blower, not shown, through a conduit, indicated diagrammatically at 30a in Fig. l. The housing has a forwardly extending sleeve 3l communicating interiorly therewith, the forward end of the sleeve 3l being secured to the open inlet end of a refractory lined combustion chamber, indicated diagrammatically at 32. Within the sleeve of the secondary air housing is a plurality of directional vanes 33 carried on radially extending rock shafts 33a extending outside of the sleeve 3l. The outer ends of the shafts 33a are bent over and received in notches in a rotatable plate 34 which is rotated through the medium of a screw controlled lever 34a, see Fig. 8, for setting the vanes at predetermined angles so as to impart the desired swirling motion to the air passing from the housing 3U into the sleeve 3l and combustion chamber. The directional vane assemblage is preferably the same in form and function as that more fully described in Letters Patent No. 1,923,330, issued to me on August 22, 1933. From front to rear, entirely across the interior of the secondary air housing 3G, is a sleeve 35 of sufficient diameter to accommodate the fuel gun casing, the sleeve 35 being sealed from communication with the interior of the housing. On the sleeve is a thick annular flange 36 which forms the rear wall of the housing 30 and which snugly receives an enlarged diameter portion 36a on the body portion I of the gun for supporting the gun casing. IThe annular flange 36 is provided with longitudinal ducts 31, 38, and 39 respectively which at their discharge ends open through the rearward face of the annular ange 36, the open end of each being provided with a suitable compressible sealing washer such as indicated at 40. The body portion I of the gun is provided with an external annular flange 4I having a forwardly exposed face complementary to a portion of the rear face of the iiange 36. The annular flange 4I is provided with a plurality of radial ducts 42, i3 and 44 having short longitudinal extensions which open through the forward face of the annular flange lIl in position to communicate with the ducts 31, 38, and 39 respectively when the gun is slid into operating position in the housing Sil. The washers lil are so arranged that when the gun is moved into operating position and the complementary ducts in the anges 3E and Il communicate with each other, the junctures of the ducts are sealed thereby. It should be noted that the ducts 42 and 133 which supply lubricating oil and fuel oil respectively form ccntinuations of the ducts I5 and IS respectively. The duct (I, however, for supplying gaseous fuel from the duct 39 discharges directly into the casing of the gun as illustrated in Fig. 4.

Mounted on the rear wall of the body portion I of the gun `is a tubular inlet conduit l5 having its discharge opening lying in an upright plane and coaxial and communicating with the interior of the body portion I at the inlet end of the body portion. The conduit d5 is curved so that the opposite or inlet opening thereof lies substantially in a horizontal plane. At its inlet end, the conduit 45 is provided with a horizontal external flange 46, the lower face of which is snugly received on and slidable along the upper face 51a of a support 41, which extends rearwardly from the secondary air housing and preferably is rigidly carried thereon.

In order to provide a slide-way for the fiange i6 so as to slidably fasten the gun onto the support l1 through the medium of the flange 13.3, guides 48 are provided, the guides extending longitudinally of the support II'I along the sides thereof in overhanging relation to the upper side margins of the flange 45. The support IVI and guides are operable to receive the flange i6 and maintain the gun coaxial with the flange 3G when slid rearwardly out of operating position.A

As explained in the objects above set forth, there would be extreme danger of explosion were the gun withdrawn from operating position while any of the supply ducts were open and discharging. In order to prevent the discharge of fuel or lubricating oil through the ducts 3i, 38, and 39, these ducts are provided with radial extensions 31a, 38a, and39ct, respectively, each of which extensions is provided with a stop cock I9 operable when closed to block the duct with which associated. Rotatably mounted on the housing 30 is an annular control ring 50 having a plurality of radially extending arms 5I. The outer end of each of the arms 5I has a lug which is received between a pair of yoke arms Sla on the handle of the stop cock with which it is associated. The stop cocks 49 are arranged to open and close when their respective handles are rotated by the arms 5I, consequent upon rotation of the control ring 50 to different positions. The

relation between the yoke arms 5|a vand the arms 5| are such that the stop cocks are operated to open and close concurrently with respect to each other when the ring 50 is rotated.

The control ring 50 is provided with an operating handle 50a by which it may be rotated to and fro selectively.

In Fig. 2, the ring is rotated so that all of the stop cocks 49 are in the open position, and in Fig. 3 the plate has been rotated so that all of the stop cocks are in closed position.

In order to latch the gun in operating position a swinging latch 52 is mounted on the support 41 and arranged to be moved into and out from latching engagement with a complementary latching element 53 on the conduit 45.

As better illustrated in Figs. 1, 6, and 7, the latch 52 is mounted on a rock shaft 54, the rock shaft 54, in turn, being provided with parallel supporting stud rock shafts 55 eccentric thereto and rigid therewith for a purpose later to be described. The latch is rockable on and relative to the shaft 54. A spring 56 is connected at one end to the shaft 54 and at the other end to a pin 5'! rigid with the latch 52 for swinging the latch consequent upon rocking the shaft 54. In order that the ducts of the flange 4| and the corresponding ducts of the flange 36 may be sealed at their junctures, it is necessary that the complementary face of the flange 4| be drawn into stressed engagement with the washers 4D. The latch 52 is arranged to accomplish this result.

In Figs. 6 and '7, the latch is shown in latching position, in which position the eccentricity of the shaft 54 is to the left and the latch 52 is drawn against the latch element 53. Carried on and rigid with the stud shaft 55 is an operating handle 58 which is disposed in upright position when the latch 52 is in latching position. In order to release the latch 52, the handle 58 is swung downwardly toward the latch. This action disposes the eccentricity of the shaft 54 upwardly, rst reducing the stress on the latch 52 resulting therefrom and then moving the latch slightly to the right, at the same time, through the medium of the spring 56, rocking the latch 52 downwardly clear of the latch element 53.

It should be noted that the latch element 53 and latch 52 are slightly under-cut, as indicated at 59, so that a longitudinal pull or stress on the latch 52 more firmly interlocks the two and prevents the latch 52 from dropping or camming downwardly off the element 53.

When the latch 52 is swung downwardly so that the gun is released, the danger that the handle 56a.v will be operated subsequently to open the stop cocks 49 remains. In order to prevent such operation while the gun is unlatched or withdrawn, a lug 60 is provided on the latch 52 which, in the form illustrated, is disposed on the opposite side of the rocking axis from the latching head of the latch so as to move upwardly as the latch 52 is lowered. A pair of spaced shoulders 6| is provided on the ring 56 in position to receive'the lug 68 therebetween when the ring 50 is rotated to dispose the stop cocks in closed position and the latch is in idle position. The engagement of the lug 60 between the shoulders 6| prevents rotation of the ring 58 at all times eX- cept when the latch 52 is thrown into latching position.

Assuming the gun has been moved into operating position, the latching operation is effected by throwing the handle 58 upwardly. This operation, through the medium of the spring, lifts the latch 52 into alignment with the latching element 53, the eccentricity of the shaft 54 being so positioned that the latch 52 can pass upwardly behind the` element 53. Continued upward movement of the handle disposes the greatest eccentricity of the shaft 54 away from the latch element 53 thus engaging the latch with the element 53 and stressing the two into engagement. The eccentricity of the shaft 54 and the shaft 55 is so disposed that when the handle 58 has been moved to upright position, the axis of the shaft 54 is slightly below the horizontal plane through the axis of the shafts 55, or slightly below the direction of the resultant stressing force through the latch 52. The effect of the resultant force therefore, is such that it tends to rotate the shaft 55, due to the eccentricity, further in a direction to dispose the handle upwardly. Thus an action is effected which utilizes the actual stress of the latch 52 for maintaining the latch and element 53 in latching condition. Due to the under-cutting 59 of the complementary latch elements, it is, of course, necessary that the latch 52 be moved slightly to the right before it can be swung downwardly. This result is also effected by the eccentricity of the shaft 54, which upon downward movement of the handle 58, moves the latch 52 to the right, as explained. When the latch 52 is fully engaged, the ring 58 is released by the lug gg so that it may be rotated to open the stop cocks In order to prevent an unskilled operator from moving the handle 58 downwardly and releasing the latch while the ring 50 is rotated to position to open the cocks 49, a guard 62 is provided on the ring, the guard 62 being positioned to overhang the handle 58 when the cocks are open, as illustrated in Fig. 2, so that it is impossible to swing the handle downwardly while they are in open condition. On the other hand, when the ring 50 is rotated to close the stop cocks, as illustrated in Fig. 3, the guard 62 is moved out of over-hanging relationship to the handle 53 and the handle can be grasped by the operator and moved to release the latch 52. The guard 62 may, if desired, be provided with a cam surface 53 for insuring movement of the handle 58 to fully upright position.

As explained above, primary air is supplied into the interior of the gun through the tubular conduit 45. The gun, however, is generally used for pulverized fuel, which, along with the primary air, may be blown into the gun through the conduit 45 from a suitable air swept attrition mill which is not shown herein but fully described in my co-pending application Serial No. 732,125, filed June 23, 1934. On the support 4l is a feed conduit 66 which leads to the discharge duct of the air swept attrition mill so that air laden with pulverized fuel may be discharged therethrough into the gun. The conduit 66 opens. at its outlet end through the surface supporting the lower end of the inlet conduit 45 and in position to be placed in axial alignment and communication with the horizontal end of the conduit 45 when the gun-is in operating position.

It is apparent that if the gun were removed while the duct 66 were discharging pulverized fuel and air, that dangers of explosion would be too pronounced and it is necessary to provide means for blocking the discharge of pulverized air and fuel from the conduit 66 when the gun is moved out of position. For accomplishing this purpose, a slide door 68 is provided, this door 68 lying on the support 41 and being slidable therealong while held in position betweenthe guides 48. On the slide door B8 are latch elements 69 which are pivotally connected thereto and swing outwardly for disconnecting the slide door and flange 4S. The forward end of the flange 46 is notched, as indicated at 10, to provide a shoulder for engagement with the elements 69 for latching the conduit 45 and slide door for sliding movement together. The latch elements 69 are so positioned that their outer margins are engaged by the inner walls of the guides i8 when inconnecting position and thus are prevented from swinging apart and releasing from the shoulders 10. The guides 48 terminate rearwardly longitudinally of the support 4l short of the rear limit thereof so that when the innermost end of the flange 46 is moved to the rear limit of the support, the latch element 69 will be beyond the guide 48 and thus free to swing outwardly, as indicated in dot and dash lines in Fig. 5, and in this position will be swung apart due to the slope of the shoulders l0. Thus when the conduit is slid rearwardly beyond the open end of the conduit 6B, the slide door is positioned over the open end there and the latch elements 69 are disengaged,

A suitable downwardly projecting pin 'l2 which extends into a longitudinally extending slot i3 in the slide surface 41a. of the support 41 is provided, the slot 13 terminating in such a position as to engage the pin and stop rearward movement of the slide door when the door is in the position for blocking the conduit 66. Obviously, when the conduit is again placed on the support and moved into position it abuts the rear end of the slide door 68 in a position to be engaged by the latch elements @Si when they are again swung inwardly by engagement of their outer edges with the guide members 48 consequent upon movement of the gun toward operating position.

As explained above, the spinner 5 is flared outwardly exteriorly near its discharge end and the blades 5 lie substantially in the plane of the discharge opening of the extension 3. This restricts the passage of air through the opening while permitting free expansion of the air after it has passed the opening, with the result that back pressure is eliminated and the air passes the blades 6 at extremely high velocity. Consequently, the spinner cup is rotated at a correspondingly high velocity.

Furthermore, due to this high velocity, fuel particles thrown out by the gun will not strike the adjacent rear wall of the combustion chamber but will be carried forwardly surrounded by the stream of air passing the vanes 33 and thus retained in spaced relation to the side walls of the combustion chamber, though subject to the radiant heat thereof. Due to the fact that the spinner cup rotates at such extremely high velocity, it would tend to vibrate with such intensity as to damage the remainder of the equipment were the cup not properly balanced. In fact, the slightest unbalanced overhanging load would create so much vibration that the gun would operate for only a short period. To eliminate this action, the spinner cup 5 and extension 21, which form, in effect, a unitary structure, are balanced across the forward bearing 26 so that, insofar as the bearing 26 is concerned, the weight of the portion of the spinner and extension in front of the forward bearing is equal to that to the rear of the bearing. The rear bearing 26 is merely a guide bearing supporting substantially no weight whatsoever. Thus unbalanced load is eliminated and the vibration so reduced as to be unnoticeable. As in all high speed rotary elements, the cup is likewise balanced about its horizontal axis.

It is apparent from the foregoing description that discharge from the supply ducts is practically prevented except when the gun is latched in operating position. Further, it is apparent, that by utilizing the particular arrangement of spinner in which the impeller blades are carried directly on the cup 5, that great simplicity is effected, that the gun as a whole may readily be removed for cleaning or servicing and that the various parts thereof may be removed for repair or replacement individually or in assembled condition.

Having thus described my invention, I claim:

l. A pulverized fuel gun comprising a body having a fuel duct, a support, means mounting the gun on the support for sliding movement into and out of operating position, a fuel supply duct having a discharge opening positioned for communication with the fuel duct of the body when the gun is slid along the support into operating position for supplying fuel to be discharged, a slide door carried by said support and slidable therealong to and from blocking relation with respect to said supply duct, means for latching the door to the gun for movement of the door thereby into said blocking relation to the supply duct when the gun is slid to a predetermined inoperative position, and means operated consequent upon movement of the gun into said inoperative position to release the latching means, whereby the door is released in blocking relation to said supply duct.

2. A fuel burning device including a fuel gun, a supporting means for the gun, means mounting the gun thereon for movement to and from operating position, said supporting means having a fuel supply duct opening through a wall thereof and connected to the gun for discharging into the gun when the gun is in operating position, and being disconnected from the gun when the gun is moved out of operating position, avalve for opening and closing said duct, a latch for latching the gun in said operating position, guard means mounted for movement to and from guarding position with respect to the latch for preventing releasing operation of the latch when the guard means is in guarding position and for permitting release of the latch when the guard means is out of guarding position, and means to open the valve when the guard means is moved to guarding position and to close said valve when the guard means is moved out of guarding position.

3. A fuel burning device comprising a fuel gun, a housing therefor, means supporting said gun in operating position and for movement to and from operating position with respect to the housing, said housing having a plurality of supply ducts communicating at their discharge ends with the gun when the gun is in operating position, said gun having a plurality of discharge ducts, said gun ducts having inlet openings communicating with the discharge ends of the housing ducts respectively when the gun is in operating position within the housing and said gun ducts being disconnected from the housing ducts when the gun is moved out of operating position, valves for opening and closing the housing ducts, a latch for latching the gun in operating position with corresponding ducts of the gun and housing in communication with each other, an operating handle for the latch, a movable abutment means cooperable with the handle for preventing operation of the handle to release the latch when the abutment means is in oneposition and for permitting operation of the handle to release the latch when the abutmentmeans is moved out of said one position.,:and means operatively associated with the valves and abutment means and operated to close the valves consequent upon movement of the abutment means out of said one position.

4. A fuel burning device including a fuel gun having a fuel inlet duct, supporting means mounting the gun for movement to and from operating position, means for supplying fuel to said duct, a Valve for controlling the supply of fuel to said duct, a latch for latching the gun in operating position, guard means operatively associated with the device and mounted for movement to different positions and operative to prevent release of the latch when moved to one position and to permit release of the latch when moved to another position, and means operated consequent upon movement of said guard means to position for permitting release of the latch to move the valve to closed position and operated consequent upon movement of the guard means to the position for preventing release or" the latch to move the valve to open position.

5. A fuel burning device comprising, a fuel gun, supporting means mounting said gun for movement to and from operating position, means having a plurality of fuel ducts communicating With the gun for supplying fuel thereto when the gun is in operating position, and communicating with the atmosphere when the gun is out of operating position, a ring rotatably mounted on said last mentioned means, valves for opening and closing the ducts respectively, said valves being xedly spaced apart from each other in surrounding relation to the ring, and levers operatively associated with the valves and carried on said ring for opening and closing the valves when the ring is rotated to and from given positions, means for latching the gun in operating position and means movable into position by the ring when the ring is rotated to position for opening the valves for preventing release of the latch means.

6. A fuel burning device comprising a gun, a support mounting said gun for movement to and from operating position, means having a plurality of fuel ducts for supplying fuel to the gun, said ducts being arranged for communicating with the gun when the gun is in operating position and with the atmosphere when the gun is moved from operating position, valves for opening and closing said ducts, means for latching the gun in operating pcsition, movable means operatively associated with the valves and movable to different positions for opening and closing the valves, and a guard operated by the movable means to prevent release of the latching means when the last mentioned means is moved to a position to open the valves and to permit release of the latching means when said movable means is moved to position to close the valves, and means for preventing movement of said movable means to position for opening the valves While the gun is unlatched.

7. A gun for pulverized fuel comprising a body having a fuel inlet duct and a communicating discharge duct, a support, means mounting the body on the support for movement relative thereto into and out from operating position, a fuel supply duct having a discharge opening position for communication with the inlet duct when the gun is moved relative to the support into operating position for supplying fuel to be discharged, a door associated with the said support and movable thereby into said blocking relation to the supply vduct when the `gun is moved to a predetermined inoperative position, means operated consequent upon movement of the gun into said inoperative position to release the latching means from the door, whereby the door is released in blocking relation to said duct.

S. A fuel gun and mounting, comprising, an atomizing spinner, bearing means rotatably supporting the spinner in coaxial relation with the gun, said gun having a lubricant supply duct for supplying lubricant to the bearing means, means mounting the gun for movement to and from operating position, a valve for controlling the supply of lubricant to said duct, a latch for latching the gun in operating position, guard means mounted for movement to different positions and operative when moved to one position to prevent release of the latch and when moved to another position to permit release of the latch, and means moved consequent upon movement of said guard means to position for permitting release or" the latch for moving the valve to closed position, whereby the flow of lubricant to said bearing means is prevented while the gun is unlatched.

9. A pulverized fuel gun device comprising a gun body having a fuel inlet duct and a communicating discharge duct, a support, means detachably mounting the gun on the support for movement into and out from operating position, said gun being detachable from said support when moved a predetermined distance from operative position, a fuel supply conduit having a discharge opening positioned for communication with the inlet duct when the gun is moved relative to the support into operating position for supplying fuel to be discharged into said inlet' duct, a door, means mounting the door for movement to and from blocking relation with respect to said supply conduit, means operatively connecting the door to the gun for movement of the door thereby into said blocking relation to the supply duct when the gun is moved into a predetermined inoperative position, means for arresting continued movement of the door in the same direction from said blocking position, means operated consequent upon movement of the gun into said predetermined inoperative position to operatively disassociate the gun from the door, whereby the door is released in blocking relation to said supply duct and the gun may be moved additionally for detaching it from the support.

10. A fuel gun including a body, means supporting the gun for movement into and out of operating position, a housing accommodating said gun body when the gun is in operating position, said housing having a supply duct opening through a Wall portion of the housing, said gun having a fuel duct opening at its inlet end through a wall portion of the body and operatively connected to the supply duct of the housing when the gun is in said operating position, the said ducts being disconnected from each other when the gun is moved out of operating position, and means operative consequent upon movement of the gun into said operating position for sealing the joint between said cooperating ducts.

ll. A fuel burning device including a fuel gun, a support, means mounting the gun thereon for movement to and from operating position, conduit means for conducting fuel to the gun, a

in it has closed the valve when said gun latch is in released condition relative to the gun and operative to release and permit operation of the control means to open the valve when the gun latch is in latching position with respect to the 5 gun.

WEBSTER I. SALLEE. 

